What are the source of antibody-producing cells?
A. B cells
B. macrophages
C. plasma cells
D. T cells
E. monocytes
A. B cells
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Most scientists believe that prokaryotes evolved from eukaryotes
Indicate whether the statement is true or false.
Respond to statements 117–121 in reference to the five items
listed below. a. antigens b. antibodies c. helper T cells d. cytotoxic T cells e. effector B cells E 117. These bind, as in a lock-and-key mechanism, to foreign proteins. D 118. These produce immunoglobulins in response to the reinvasion by a virus. D 119. These directly attack the foreign cells of an incompatible skin graft. M 120. An Rh+ molecule in the body of an Rh woman is an example of these. D 121. Proteins produced by these attack bacteria and viruses in the blood.
The roots of certain epiphytes are photosynthetic. Indicate whether the statement is true or false
One critical requirement for life to arise on Earth was time for which to occur?
a. The salinity of the oceans to stabilize b. The Earth's various climates to stabilize c. Molecules to accumulate and react with one another d. The atmospheric temperature to increase sufficiently e. The ozone layer to form, so that the level of ultraviolet radiation was reduced